【摘要】 通过岩心观察、测井和地震资料分析,运用沉积学、层序地层学理论,将利津洼陷沙四上亚段分为1个层序3个体系域(LST、TST、HST),并细分为7个准层序组。研究了滩坝砂岩的沉积特征和在准层序组内的平面展布,以准层序组1、2滨浅湖滩坝最发育,准层序组3、4风暴滩坝最发育,准层序组6、7砂质滩坝发育差但发育碳酸盐滩坝。对滩坝控制因素进行了探讨,首次提出了"气(气候)-源(物源)-盆(盆地)"系统控滩坝的分析思路,是对传统"源控论"的完善与补充,可更合理解释滩坝的成因和分布,增加预测性。更多还原

【Abstract】 Based on an analysis of the core, well logs and seismic data and by using sedimentological and sequence stratigraphical theories, the Upper Submember of the Fourth Member of the Shahejie Formation in the Lijin subbasin is divided into one sequence and three systems tracts and subdivided into seven parasequence sets. The sedimentary characteristics of beach-bar sandstone and its distribution in the parasequence sets have been studied. The beach bars of lakeshores and shallow lakes in parasequence sets 1 and 2 are best developed and storm beach bars of parasequence sets 3 and 4 are also best developed. The sandy beach bars in parasequence sets 6 and 7 are poorly developed but carbonate beach bars are well developed. The controlling factors of beach bars are analyzed. The paper presents the concept of controls on beach bars by the system of "paleoclimate-provenance-basin". This concept is an improvement and supplement of the traditional "source-controlled theory" and may more rationally explain the origin and distribution of beach bars.更多还原